When doing the DLC tombs, some of the interactions were momentary, mostly opening doors that immediately shut when Lara releases whatever triggers them. It finally dawned on me that these triggers are intended for co-op play, where one player does something to hold a door open to allow the other player to go through the doorway. In the case of the Forge, there's one doorway like this, but in single player mode, it automatically opens after the player progresses to a certain point in the tomb, so it doesn't make much difference in that case. For Howl of the Monkey tomb, there are a couple of doorways that require co-op, but it seems that all there is inside are some canisters with supplies, and not any essential items.

 

Interesting, that makes some sense.  I noticed the things you can jump on to open doors in whichever level it was (forge?).  I did have a vague recollection that there was some talk of co-op play at some point but could be completely wrong!

Edited February 18, 20197 yr by SpirantCrayon22